Bump radon from 1.4.2 to 2.4.0

[dependabot-preview]

Bumps radon from 1.4.2 to 2.4.0.

Changelog

Sourced from radon's changelog.

2.2.0 (Jan 11, 2018)

• Add an option to show closures when Radon is used from flake8: #135

2.1.1 (Sep 07, 2017)

• Fix critical bug in Python 2 that prevented analysis of files with no
  comments at the start of the module: #133

2.0.3 (Aug 30, 2017)

• Fix encoding issues for all commands: #115 and #127

2.0.2 (Jun 04, 2017)

• Update mando dependency: #120

2.0.1 (Jun 02, 2017)

• Fix bug in the error message of Flake8's plugin: #121

2.0.0 (May 30, 2017)

• Add --sort option to mi command: #100
• Add comment stats summary when using the -s, --summary option of the
  raw command: #110
• Fix encoding bug: #114
• Fix raw metrics (ensure that LOC = SLOC + Multi + Single Comments + Blank):
  #118
• Python 2.6 is not supported anymore

1.5.0 (Mar 14, 2017)

• Use UTF-8 or RADONFILESENCODING to open files: #86
• Fix raw analysis bug on docstrings: #106

Commits

• 0ba9972 chore(release): bump to v2.4.0
• 5efc6c9 fix(output_file): pass all kwargs down to the deepest log functions
• 52ed049 feat(cli): add a --output_file option (#154)
• e28094d chore(main): add a main module (#153)
• 6f7b825 cli: add a --output_file option
• cce7890 chore(release): bump to v2.3.1
• e62d579 fix(iter_filenames): exclude files if they match exclude patterns
• fe65c61 fix(syntax): replace yield from since we support Python 2.7
• ae1fe87 tests(travis-ci): add Python 3.7 workaround
• 65941c7 tests(travis-ci): update travis config
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #31.